Directive 2008/50/EC of the European Parliament and of the CouncilShow full title
Directive 2008/50/EC of the European Parliament and of the Council of 21 May 2008 on ambient air quality and cleaner air for Europe
ANNEX XIIIU.K.CRITICAL LEVELS FOR THE PROTECTION OF VEGETATION
Averaging period | Critical level | Margin of tolerance |
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Sulphur dioxide |
Calendar year and winter (1 October to 31 March) | 20 μg/m3 | None |
Oxides of nitrogen |
Calendar year | 30 μg/m3 NOx | None |